California Code, Water Code - WAT § 35005

(a) It is in writing.

(b) It is executed by the person or legal representative of the person who, in accordance with the provisions of Sections 35003 or 35003.1 is entitled to the votes for which the proxy is given.

(c) It is acknowledged or certified in accordance with Section 2015.5 of the Code of Civil Procedure.

(d) It specifies the election at which it is to be used. An appointment of a proxy shall be used only at the election specified.

(e) It shall be on a form as specified by the county elections official meeting the above requirements.

Every appointment of a proxy is revocable at the pleasure of the person executing it at any time before the person appointed as proxy shall have cast a ballot representing the votes for which the appointment was given.